At Admin Panel -> Settings -> Switches, the "social bookmarking" switch enables social bookmarking options on the topic details and view posts pages. After turning the switch on, go to Admin Panel -> Settings -> Social to configure which social bookmarking services to show. AddThis includes all other social bookmarking sites within it so it makes the most compact choice, but you can also choose to show separate buttons for some of the major social networking sites like facebook, google+ and pinterest.

The social bookmarking buttons are displayed on the "topic details" template and the "view thread" template with {LINKSOCIALBUTTONS}.